Knife



H. ARNOLD Aug 7, 1928.

KNIFE Filed oct. 1, 1925 Patented Aug. 7, 1928.

PATENT OFFICE.

HUBERT ARNOLD, OF CALGARY, ALBERTA, CANADA.

KNIFE.

Application filed October 1, 1926, Serial No.

rlhis invention relates to knives of the class having a detachable cutter, such as a razor blade, carried by asuitable holder. j

One purpose of the invention is to provide a knife of this class which is designed to permit placement or removal of the cutter to be easily effected `without danger of injury to the hands of the user.

Anotherv purpose of the invention is to provide a holder having a cutter retaining latch which serves to positively position the cutter for convenient removal from the holder when said latch is moved to a cutter releasing position.

A further purpose of the invention is to `provide a novel form of cutter guard cooperatively associated with the holder and cutter retaining latch and serving, in certain positions, to lock the cutter retaining latch in operative position with respect to the cutter.

A still further purpose of the invention is to provide a knife of the class described which is constructed mainly of sheet metal in such a manner as to permit economical quantity production.

Other purposes and advantages of the invention as well as the details of construetion and combination of parts characterizing the embodiment disclosed herein will be more readily understood from the following de tailed description and accompanying drawings in which-w Figure l is a side elevation of the com plete knife showing the cutter guard positioned to overlie substantially the whole length of the cutting edge.

Figure 2 is a view similar to Figure l with the cutter guard retracted to expose the cutting edge and with parts of the holder brokenaway to show interior structure` Figure 3 is a view partly in side elevation and partly in section with the cutter guard removed and the cutter' and cutter retaining latch in the positions which these parts occupy preliminary to securing the cutter in operative position.

Figure l is a vertical sectional view take along line l-Jl of Figure 2. v

Figure 5 is a `vertical sectional view taken along line 5;-5 of Figure 2. i

Figure 6 is a vertical sectional view taken along line 6-6 of Figure 2 and Figure 7 is a sectional view taken along line 7-7 of Figure 2.

i Proceeding now to a detailed discussion 138,919, and in Canada December 23, 1925.

of the drawings, 5 designates a holder consisting of a pre-formed metal sheet folded to provide a rolled edge G and a pair of spaced side plates 7, the end portions of which are secured together by bolts 8 and 9. These side plates are slotted transversely as indicated at l0 and the upper edge portions of one plate immediately adjoining the sides of the slot are turned downwardly toprovide an interrupted guide flange 1l. In order to impart to the holder the requisite rigidity, a `reinforcing rod l2 is secured in the folded edge (i and is formed with a bent terminal 13 projecting laterally in the direction of the side platos and held in place by folding the terminal portions of one of `the side plates therearound as indicated. at

lll.

`Pivotally mounted on thc bolt 9 to operate between the side plates 7 is a blade retaining latch consisting of a sheet of metal folded upon itself to provide a rolled edge 15 and a pair of side plates 1G which are pressed. to getlier to iit between the side plates 7 and are apertured near one end to receive the pivot bolt 9 therethrough. Preferably the pivoted terminal of the latch is recessed as at 17 to give the clearance necessary for swinging the latch to and from the blade releasing position shown in Figure Mounted for limited sliding movement in the rolled edge l5 is a rod i8 terminating at one end in a laterally proj ect-ing linger 19 having a curved end 2() adaptedl to function as hereinafter Y described. A spring 2l, encircling the rod 1S, is confined between a collar 22 on the rod and one end wall of a slot Q3 formed in the rolled edge 15 and serves to urge the rod 18 in one direction. 1

The cutter preferably consists of a razor blade Q-ladapted to lit between side blades 7 of the holder as shown in Figures l 'to 3 and provided with teriniifial rece s and 2G; ln positioning the blade within the holder the parts are first arinnged as shown in Figure 3. In this figure the blade is shown in an angular position with one end fitted` between the side plates T to engage the recess`25 Iwith the bolt 8 which forms a pivot for the blade during subsequent movement' of the latter to operative positien. ll/lovement of the blade from the polsition shown in Figure 3 to that shown in Figures l and 2 is accomplished by swinging the blade retaining latch inwardly toward the holder untilthe terminal 20 of the `finger 19 is engaged in the plate recess 26.

Subsequent to this operation the inward movementof thel retaining latch is continued and during this continued movement the blade 24, through the coaction of the recess 26 and the terminal 2O of the finger 19, isswung about the pivot point 8 to the postion shown in Figures l and 2. It is desirable that the finger 19, be yieldingly pressed toward the blade during its engag ment therewith and this is` the function of the spring 2l.

In order to` provide for complete or partial coverage of the cutting edge I provide l ward the holder.

a cutterl guard consisting of a U-shaped plate including a cylindrical portion 27 and spaced side members 28 and 29. In applying this guard the cylindrical portion 27 is slidably sleeved on lthe rolledl edge 15 of the blade retaining latch with the side members 28 and 29 of the guard extending to- One of these side members, preferably that designated 28, has a 28'; and 29 have their lower edges extended .to form stops 31 and 32.-Y lVhenthe cutter Y guard ismoved tothe position shown in Figure l the stop 31- is adapted'to coact with the' guide flange 1l as shownl in Figure l and when the guard is retractedto the positionshown inFigure 2, both ofthe stopsl vandr32 coact, in a similar manner with stops 33 carried'by the side plates 7 'of the holder. Assuming the parts to be in the position i shown in Figure l and that it is desired to i usethe cutterthis 1s accomplished by sliding the cutter guard to the right unt-il a suflicient portion of the cutting edge is exposed. In this respect it is to be noted that Vthe guard will hold any position to which it is adjusted because ofthe frictional ment. obtaining andf80 and between the cylindrical portion Sfof the guard and the rolled edge l5. Inadvertent disengagement of the guard with engagethe blade retaining' latch-during movement oi'rthe .guard to blade covering or exposing positions is prevented by thel stops hereinbefore .referred to.,v When it-is desired to remove the blade from-the holderthe parts are firstarranged as shownin Figure lso as V-to ldisengage the-,guide flanges 1l and 30.

vlVjithv the `parts inthis positionthe cylindri-V cal portion of the guardis-grasped `at about a-point opposite theslots 10 'and when anv outward pull is exerted on the guard at this between the guide fianges ll,

point the blade retaining latch will swing outwardly to the position shown in Figure 3. During the initial outward movement of the retaining latch the curved end 20 of the finger 19 serves to pull the engaging end of the blade outwardly until the blade reaches the position shown in Figure 3 thereby facilitating removal of the blade without danger of cutting the hands of the user.

7henever necessary the guard may be entirely'removed from the blade retaining latch bysliding movement of the guard toward the free end of said latch.

Having fully described in the foregoing what I now conceive to be the preferred embodiment of my invention it will be understood that various changes in the construction and combination of elements may be resorted to within the scope of the invention as defined by the appended claims.

I claim:

l. A knife of the character described comprising a holder, a cutter mounted in the holder, a cutter retaining latch movably carried by the holder and directly engaging the cutter to retain the latter in operative position, said part serving, when the latch is moved to acutter releasing posi,- tion, to partially eject the cutter from the holder in order to facilitate complete removal of the cutter without injury to the hands of the user.

2; A knife of the class described comprising a holder, a detachable cutter mounted therein, means for securing the cutter to the holder including a pivotally mounted latch engageable with the cut-ter and ay cutterV guard slidably carried by said latch and operable thereon to cover or uncover the cutting edge of the cutter.

3. A knife of the class described comprising a holder, a detachable cutter mounted therein, a member passing through the holder and engaging in a recess formed in one end of the cutter and a latch having` one end pivotally secured to the holder and the other end provided with a portion adapted to engage in a recess in the other end of the cutter to cooperate with said member in securing the cutter in operative position, said latch being movable relatively to the holder ina cutter releasing direction and the cutter engaging portion of the latch serve, during such movement of the latch, to cause the cutter to pivot about the member passing through the holder and to be thereby partially ejected from the holder.

4.. A knife vof the character described comprising a holder, a detachable cutter mounted therein, means for securing the cutter to the holder including a pivotally mounted latch engageable with the cutter and a cutter guard slidably carried by said latch and operable thereon to cover or uncover the cutting edge of the blade, said cutter guard lOl) and holder being formed for interlocking engagement to secure the latch in operative position.

5. A knife of the class described compris ing a holder having a transversely eXtending` member at one end, a detachable cutter blade adaptedv to be inserted in the holder and provided With terminal recesses one of Which is adapted to engage said member, a. latch pivoted at one end of the holder and provided at the other end With a member engageable in the terminal recess of the blade to secure the latter in the holder When the latch is in operative position, a cutter guard slidably carried by said latch and movable thereon to cover and uncover the cutting edge of the blade When the latch is disposed in a blade retaining,r position, said cutter guard and holder being providedovith interlocking {ianges adapted to be engaged 20 and disengaged by moving the cutter guard to predetermined positions.

In testimony Whereoll I hereunto my signature.

v HUBERT ARNOLD. 

